The Diebenkorn hangs over the bed, the Jackson Pollock on an adjacent wall. In the living room is the Georgia O'Keeffe water lily and Edward Hopper's "Summer's Eve." The Pierre Bonnard is in the dining rooms, and so on.

"The gallery's downstairs," 17-year-old Sarah Kinney told a guest last night at the 50th birthday party that Ann Kinney threw for her husband Gilbert -- art collector, former foreign service officer, former interim director of the Corcoran Gallery of Art.

More?

"Well, there's art in all sorts of places here," said Sarah Kinney with the nonchalance that only one who grew up with it could have.

"And I bought it all myself," said Gilbert Kinney quietly, looking up at some of it on the walls by the staircase, as guests left last night -- on their way to the dinner part of the party at the Pisces Club a couple of blocks away in Georgetown. "No advisers. Who'd want an adviser to pick a wife?"

At Pisces, he got some more art for a birthday gift -- a present from Emily Brzezinski, wife of Zbigniew, once Carter's national security adviser.

"It's made to capsulate Gilbert's personality," said Zbigniew Brzezinski as his wife proudly revealed a long, amphibian-type creature of twisted wood with a spiral tail of wire. A little ball bobbed on the end of the wire.

"You don't know what it is!" Emily Brzezinski laughed in delight.

"I'm not sure I want to know," said Kinney, smiling and obviously at some loss for words.

Brzezinski says he is up to several things: "One, conculting in international affairs. Two, speaking. Three, organizing my book. Four, next fall I'm teaching two days a week at Columbia. Five, I'm fending off ambassadors, reporters and beautiful women."

Asked what he thought of the Reagan administration, he said, "I try not to think about it. I'm cheerful by nature." Pressed, he said, "Actually, I think rather well of Haig -- but that's getting serious. You don't want that, do you?"

"Who's your agent?" asked former ambassador to Mexico Joseph John Jova.

"Irving Lazar," Brzezinksi replied.

"That's great," Jova said. "All I've got is Potomac Speakers."

Others circulating through Kinney's pre-dinner cocktail party and Pisces dinner included a mix of Corcoran board members, Rep. Sidney Yates (D-Ill.), artist Gene Davis (Kinney owns two of Davis' works), two former Nigerian ambassadors -- one of whom Kinney worked for in Saigon -- Mayor Marion Barry and Kinney's "twin" niece, Joan Chandlee (she was born the same day as Kinney, her uncle). The Kinneys were early supporters of Barry. He was seated at their table during the dinner for 128 Ann Kinney is the executive assistant in the city's office of business and economic development.

At Kinneys' house, city administrator Elijah Rogers and Barry's general assistant Ivanhoe Donaldson kibbitzed with Pennsylvania Avenue Development Corporation chairman Max Berry.

"Gil's birthday was last month," said Donaldson, putting an arm around Kinney, "He just wanted to have a party."

"This guy has never told the truth," insisted Kinney.

Nuala Pell, wife of Sen. Claiborne Pell (D-R.I.), was there. Her mother, Josephine Bryce, once owned the O'Keeffe in the Kinney living room. "It looks much better here than it did in her house," said Pell.